Apparatus for roasting and drying ores



N0. 6|2,I85. Patented Oct. Il, |898.

P. ARGALL.

APPARATUS FOR RUASTI Y ND DRYING GRES.

(Application filed an. 1898,) (No Model.) 3 Sheets-Sheet I.

Patented Oct. Il, |898.

- P. ARGALL. APPARATUS FOR ROASTING AND DRYING GRES.

(Application led J an. 15, 1898.) (No Model.) 3 Sheets-Sheet 2.

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No. 6|2,I85. Patented Oct. Il, |898. P. ARGALL.

APPARATUS FOR ROASTING AND DRYING DRES.

(Application filed Jan. 15, 1898.) (No Modl.) 3 Sheets-Sheet 3.

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PHILIP ARGALL, OF DENVER, COLORADO.

APPARATUS FOR ROASTING AN-D DRYING ORES.

SPECIFICATION forming part of Letters Patent No. 612,185, dated October1 1, 1898. Application filed January 15, 1898. Serial No. 666,798. (N0IIlOflelJ To all wtont it nuty concern:

Be it known that I, PHILIP ARGALL, a c itizen of the United States,residing at Denver,

in the county of Arapahoe and State of Colo-` rado, have inventedcertain new and useful Improvements in Apparatus for Roasting and DryingOres 3 and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates to improvements in apparatus for roasting anddrying ores, for which Letters Patent of the United States were grantedto Vme October 19, 189,7, No. 591,909; also Canadian Letters Patent,dated November 2,1897, No. 57,967; and it consists in a modification ofthe hood or discharge end of the apparatus, designed particularly foruse when the apparatus is to be employed for roasting ores, which is oneof its most important functions.

It further consists in an improved fire-box, which is used inconjunction with the said hood.

Reference is made yto the accompanying d rawin gs, forming a part ofthis specification, in which- Figure l is a side elevation of myimproved hood at the discharge end of the apparatus, partly in sectionand partly broken away, showing also portions of the multitubular groupof cylinders which terminate in the said hood, also partially insection. Said gure also shows the discharge-hopper in position fordelivering the roasted or dried ore into a vehicle for conveying thesame away. Fig. 2 is an end View of the said hood, also partially insection and partially broken away, showing also the discharge-hopper inplace. Fig. 3 is a sectional viewr of my improved re-boX, shown inposition at the entrance of the improved hood, the termination of thelatter being partially shown, also in section. Fig. 4 is a front endview of the improved iire-box on a line of sight parallel with the axisthereof. Fig. 5 is a rear end view of said fire-box on a line ofsightparallel with the axis thereof and before the rear brick wall isinserted. Said Figs. 3, 4, and 5 also show the movable wheeled truck onwhich the nre-box is mounted.

Like letters of reference refer to like parts.

The multitubular system of rotary apparatus for roasting and drying oresis an improvement on the well-known tubular system, and isifullydescribed in my said patent, No. 591,909. The tubes, portions of whichare shown in Fig. 1 at a a a3, are lined throughout with fire-resistingmaterial, such as fireclay or fire-brick, (shown at (1,) and theyterminate at the discharge end in a single enlarged tube or hood Q, thewhole being suitably supported, so as to be rotated by the applicationof suitable power. Said hood is also lined with ire-resistin g materialand is made with a convergent or conical end D, as shown in thedrawings, leaving a terminal opening A,

through which hot gases enter from the iirebox. (Illustrated in Figs. 3,et, and 5.) The hood is furnished with circumferential openings B,located at intervals, which are boxed with hollow flanged castings E,set into the {ire-clay lining and secured to the metal of the hood bymeans of bolts F F or in any substantial and workmanlike manner. Theobject of these openings is to form -an outlet for the roasted or driedore as the several holes during the revolution of the cylinder or hoodsuccessively approach the bottom point of their travel, when the oredrops out vthrough the same into the hopper L, suitably placed toreceive the same. Said hopper is supplied with a sliding gate Z, bymeans of which the ore can be periodically discharged into a car orother receptacle for conveying it away.

N N denote I-beams, which sustain the hopper L.

C denotes a ixed metallic band, usuually of wrought-iron, covering allthe holes B ex* cept those at -or near the bottom point of travel,(132,) the object of said band being to keep the iiame and hot gasesfrom escaping through the said discharge holes or openings in theperiphery of the hood. This band resembles a brake-strap on a wheel andis kept in its proper position by means of Iianges Gl G on the outerportion of the castings E E and a suitable support II at the top androds I I at the bottom. The said rods are preferably sustained upon thehopper L. The band C is strengthened and stiftened by a T-shaped ironreinforce K.

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In drying ores the ore to be operated upon is usually of a much coarscrgrade than that for roasting, and the temperature is much lower. Thegeneral operation is, however, the same as when the apparatus is usedfor roasting.

improved hood is a metallic shell or vessel, preferably of steel,circular in cross-section, lined throughout with fire-resistingmaterial, such as fire-brick d', and preferably adapted for oil or gasfuel. In the accompanying drawings, M is the fire-box, having anextension M', also of circular contour, adapted to enter and fit theentrance A of the hood Q, as shown in Fig. 3. box-like structure orcarriage M, mounted on awheeled 'truck O, moving, preferably, 'on railsr r, so as ltobe readily and quickly drawn back from the opening of thehood for purposes -of repairs, and is made readilyadj ustable `astoheight at lthe front end by mean-s of hinged or rocking bearings q gatthe rear and jack-screws s s at the front end of the carriage, wherebyit is made to accurately aline with the opening A in the hood and iskept in ali-nement through all the unavoidable changes due totemperature, use, and wear. The rear end of the box is built up withhre-brick, leaving such openings -as are necessary to admit yoil or gasfuel and lair for purposes of combustion. As the rotary furnaceisusually set at an inclinationof one inch to the foot, a similarinclination is givenfto the lire-box bythe difference in the height ofthe front and back supports, as shown, the carriage and the track beinglevel. The advantages of this fire-box in connection with theimproved'hood are that the flame is thus conducted directly into thefurnace. The vouter steelwork of thefurnace and hood does not becomeoverheated vand burned, aswas the casewhen the latter was inclosed bythe brick- Work,as in my Patent No. 591,909, above referred to, duepartly to the radiation of heat from the red-hot brickwork upon thesteel plates of the furnace and i-n part to the direct action of flameescaping outward from the firebox between the brickwork and the furnacewhen using forced draft.. The steel tubular fire-box is also lessexpensive to construct than a stationary brick one, while being muchmore convenient to operate and especially useful where quick yand rapidadjustments are The fire-box is set in a` necessary when occasion arisesfor sudden repairs.

I claim and desire to secure by Letters Iatent- I. In an ore roasting ordrying furnace, a

- multiple revoluble group of independent cyl- The fire-box which Iprefer to use with this inders merged in a single large tube or hood Q,at the discharge end of the apparatus, said hood having a convergent cndD terv minating in a circular opening, and overlapping the outside ofthe lined terminal flue of a portable fire-box, substantially asspecied.

2. In an ore roasting or drying furnace, a multiple revoluble group ofindependent cylinders merged in a single large tube or hood Q at thedischarge end of the apparatus, said hood having a convergent end Dtermina-ting in a Icircular opening, adapted for the admission of theterminal lIiue of 'a portable ire-box, discharge-openings located atintervals aro-und the periphery of said hood near the angle ofconvergence, and a stationary flat metallic band C covering the seriesof peripheral discharge-openingsexcept at-or near the poi-nt ofdischarge, substantially as specied.

3. In an ore roasting'or drying furnace, a multiple revoluble group ofindependent cylinders merged in a single large tube or hood Q at thedischarge end of the apparatus, said hood having a convergent end Dterminating in a circular opening, in combination with a portablemetallic fire-box M lined with refractory material, sai-d lire-boxhaving a tubular projecting fiue M adapted to enter and iit theconvergent end D of the rotary hood Q, substantially as specified.

4t. In combination with the hood or terminal portion of a revolvingfurnace, a firebox M having a tubular projection M', lined throughoutwith fire resisting material, mounted on a wheeled truck by means ofrocking bearings at or near the rear portion and elevating-screws at thefront portion, whereby the said fire-box can be accurately alined withthe opening in the said hood, and readily drawn back for repairs,substantiall y as specified.

In testimony whereof I affix my signature in presence of two witnesses.

PHILIP ARGALL.

Witnesses:

HENRY A. VEZIN, 'HARRY E. NELSON.

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